Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.


(Units) one thousandth of a roentgen


(ˈmɪl əˌrɛnt gən, -dʒən, -ˌrʌnt-)

1/1000 of a roentgen. Abbr.: mR, mr
Mentioned in ?
References in periodicals archive ?
An indicator shows the net radiation exposure in milliroentgens. Pocket ionization chambers generally are sensitive to exposures ranging from 0 to 200 mR.
the Department of Energy says we receive between 35 and 50 milliroentgens every year from the sun and from 20 to 35 milliroentgens every year from our food.
(57) Eriksen indicates the total radiation from study x-rays are estimated from 136 to 211 milliroentgens (mR) at skin entrance when using lead filters.